LIPID-PEROXIDATION AND CHLOROPHYLL LEVELS IN SPINACH DURING REFRIGERATED STORAGE AND AFTER INDUSTRIAL PROCESSING

Chlorophylls a, b and pheophytins a, b were quantitatively determined in raw, frozen and canned spinach. About 15.9% was lost during the fre ezing process and 99.9% after canning as a consequence of the heating used in industrial processing. Pheophytins a and b (3.28 and 3.00 mgkg (-1)) were the predominant chlorophyll degradation derivatives for sam ples stored in a refrigerator at 8 degrees C for three weeks. The degr adation limit of stored samples was around 13-15 days with 2.54 and 1. 30 mg kg(-1) for pheophytins a and b, respectively. Lipid peroxidation during spinach senescence, as a consequence of being cold stored or p rocessed, increased particularly during the canning process with 3.40 mu mol equivalent MDA. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.